This article explains the meaning of syslog message " CM_CMERROR_FABRIC_REMOTE_PFE_RATE ".

The following message is logged in the file.

Aug 26 17:54:19.691  router-name fpc0 Error: /fpc/0/pfe/0/cm/0/CM[0]/0/CM_CMERROR_FABRIC_REMOTE_PFE_RATE (0x2e0002), scope: board, category: functional, severity: minor, module: CM[0], type: MPC fabric remote PFE error (rate based) 
Aug 26 17:54:19.088  router-name fpc0 PFE 0: exceeding rate threshold 5, curr/last err_cell (288/186) 

These log messages appear for a particular FPC (FPC0 in this case) whenever the FPC receives errored packets/parcels from a remote FPC. If the rate of reception of these errored parcels exceeds a threshold for three consecutive intervals, a minor alarm is raised as shown:

root@router-name> show chassis alarms no-forwarding

10 alarms currently active
Alarm time               Class  Description
2021-08-26 17:54:19 PDT  Minor  FPC 0 Minor Errors

Refer to KB37455 - Parity errors occured on one FPC causing minor alarms for other FPCs on the same router [juniper.net] for details on isolating the source FPC that is causing these errors and for the recovery steps.